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  1. #11
    Join Date
    Aug 2007
    Posts
    612

    Default Re: Wiring shed with 10-3 wire

    Quote Originally Posted by jpmaddog View Post
    I called the permit guy and here's what he said:

    I need:
    A sub panel box with a main shutoff switch
    A 8' grounding rod at the shed
    To keep neutral and ground separate
    A 12" trench (which he must see)(and he recommends conduit)
    GFI protected outlets

    Now I have 3 questions:

    1. If I run the wire out the block wall to the outside, it will have to travel 4' down the outside wall to the ground. Does the UF cable need to be inside conduit and what keeps the top waterproof.

    2. The 10-3 UF wire is about 3/4 wide, should I use 1" conduit or would 1 1/2" or even 2" be better? (the trench will only be 40' long and it costs between $1 and $2.50 per 10 feet depending on size.)

    3. what does he mean by keeping the neutral and ground separate?
    1. It should be in conduit when it exits the house and down the wall then the top will be watertight. Caulk around where the conduit comes through the house.

    2. I would use 1-1/2".

    3. In the subpanel in the outbuilding you will have a terminal bar that is used for the neutrals and a separate terminal bar that is used for the ground wires. This is different than what you probably have in your house panel where the neutral and grounds share space on the terminal bar in your circuit breaker panel. The sub panel neutral terminal bar will be connected to the neutral wire that is running back to the house panel. The sub panel ground wire terminal bar will have a bare copper wire that runs to your ground rod. I do not believe you want a ground wire between the house and outbuilding since you have the ground rod, but I am sure someone will confirm or correct this.
    Last edited by bp21901; 03-12-2010 at 12:30 PM.

  2. #12
    Join Date
    Jun 2007
    Location
    Shamokin, Pa.
    Posts
    645

    Default Re: Wiring shed with 10-3 wire

    A few other points to ponder:
    NEC 300.5[D][4] PVC conduit installed above ground and exposed to damage must be Schedule 80.
    NEC 250.32[A] When the detached garage is served by only one branch circuit a grounding electrode system is not required.
    So you do need a grounding rod.[Two circuits].
    I too would use the largest PVC possible. Not really a deal breaker in the price difference in PVC diameters. And planning for the future as well.
    I would not pull Romex nor even UF cable. While UF is of course permitted per NEC 340.10. Buried PVC is classified as a wet location. I would suggest using THHW cable, suited for dry & wet locations. You will need FOUR cables anyway. Two hots, a neural and a ground cable. Basically the last two will keep the neutral & ground separate. And separate cables would be an easier pull as well.
    Last edited by Ernie_Fergler; 03-14-2010 at 08:40 AM. Reason: spellin, of course.

  3. #13
    Join Date
    Mar 2009
    Location
    wisconsin
    Posts
    159

    Default Re: Wiring shed with 10-3 wire

    just sleve the wire with pvc a foot below grade and string the uf in the trench. this will be the cheapes. if you were puttin a 100 amp panel id do it differnt, but your not. this is simple and cheap. The AHJ is deffinetly going beyond what is required, but what do ya do??

  4. #14
    Join Date
    Jun 2007
    Location
    Shamokin, Pa.
    Posts
    645

    Default Re: Wiring shed with 10-3 wire

    Quote Originally Posted by sparky1 View Post
    just sleve the wire with pvc a foot below grade and string the uf in the trench. this will be the cheapes. if you were puttin a 100 amp panel id do it differnt, but your not. this is simple and cheap. The AHJ is deffinetly going beyond what is required, but what do ya do??
    I would agree with that.
    Great minds think alike...

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